Process for brominating unsaturated organic compounds using a quaternary phosphonium tribromide as the brominating agent
    4.
    发明授权
    Process for brominating unsaturated organic compounds using a quaternary phosphonium tribromide as the brominating agent 有权
    使用三溴化鏻作为溴化剂溴化不饱和有机化合物的方法

    公开(公告)号:US08372921B2

    公开(公告)日:2013-02-12

    申请号:US13057255

    申请日:2009-08-13

    申请人: John W. Hull, Jr.

    发明人: John W. Hull, Jr.

    IPC分类号: C08F8/20 C08C19/12

    摘要: Compounds or polymers that contain carbon-carbon unsaturation are brominated using a quaternary phosphonium tribromide as the brominating agent. The bromination process proceeds easily under mild conditions. The process can be highly selective. When the substrate is a butadiene polymer or copolymer, the brominated product tends to have excellent thermal stability.

    摘要翻译: 含有碳 - 碳不饱和键的化合物或聚合物使用三溴化鏻作为溴化剂溴化。 溴化过程在温和条件下容易进行。 该过程可以是高选择性的。 当基底是丁二烯聚合物或共聚物时,溴化产物倾向于具有优异的热稳定性。

    One-step preparation of 4,6-dinitroresorcinol from resorcinol
    8.
    发明授权
    One-step preparation of 4,6-dinitroresorcinol from resorcinol 失效
    间苯二酚一步法制备4,6-二硝基间苯二酚

    公开(公告)号:US5371303A

    公开(公告)日:1994-12-06

    申请号:US213767

    申请日:1994-03-16

    CPC分类号: C07C201/08

    摘要: 4,6-Dinitroresorcinol is prepared by reacting resorcinol with concentrated nitric acid that is substantially free of suboxides of nitric acid. It has been found that greater than 60 percent yields of the desired product can be obtained when the concentration of aqueous nitric acid used is between about 80 and about 93 weight percent, and the concentration of suboxides is less than about 2 weight percent based on the weight of nitric acid.

    摘要翻译: 通过使间苯二酚与基本上不含硝酸的低氧化物的浓硝酸反应来制备4,6-二硝基间苯二酚。 已经发现,当使用的硝酸水溶液的浓度为约80-约93重量%时,可以获得所需产物的大于60%的产率,并且低聚物的浓度小于约2重量%,基于 硝酸重量。

    Process for the preparation of 2-alkyl-5-hydroxypyrimidines from
1,3-diamino-2-propanol and an alkanecarboxylic acid
    9.
    发明授权
    Process for the preparation of 2-alkyl-5-hydroxypyrimidines from 1,3-diamino-2-propanol and an alkanecarboxylic acid 失效
    从1,3-二氨基-2-丙醇和链烷羧酸制备2-烷基-5-羟基嘧啶的方法

    公开(公告)号:US5189166A

    公开(公告)日:1993-02-23

    申请号:US916298

    申请日:1992-07-17

    申请人: John W. Hull, Jr.

    发明人: John W. Hull, Jr.

    IPC分类号: C07D239/36

    CPC分类号: C07D239/36

    摘要: A process for the efficient manufacture of 2-alkyl-5-hydroxypyrimidines from relatively inexpensive raw materials is provided.The vapor phase condensation/cyclization of 1,3-diamino-2-propanol and an alkanecarboxylic acid produces an equilibrium mixture of 2-alkyl-5-hydroxytetrahydropyrimidine and 2-alkyl-5-(aminomethyl)oxazoline. After separation from the oxazoline, the tetrahydropyrimidine can be dehydrogenated under mild neutral conditions with manganese dioxide to produce 2-alkyl-5-hydroxypyrimidines.

    摘要翻译: 提供了从相对便宜的原料高效制备2-烷基-5-羟基嘧啶的方法。 1,3-二氨基-2-丙醇和链烷羧酸的气相缩合/环化产生2-烷基-5-羟基四氢嘧啶和2-烷基-5-(氨基甲基)恶唑啉的平衡混合物。 在与恶唑啉分离后,四氢嘧啶可以在温和的中性条件下用二氧化锰脱氢,得到2-烷基-5-羟基嘧啶。